Although Uncode is flexible, with a commercial theme we try first to replicate the most common web-design and usability patterns. Multiple menu styles within the same site is not common and could disorient most visitors. In any case if you need to apply different menu styles to different pages for special needs, you can use this hook (in the Child Theme) and insert the IDs of the pages you need to be modified into the "$ ids" array.

/**********************
*
* Filter menu type according with post ID (or any other condition)
* @param string   $val The default menu type
* @return $val
*
**********************/
add_filter('option_uncode', 'uncode_child_filter_display_menu');
function uncode_child_filter_display_menu( $val ){
    global $post;
    $ids = array(2, 3541, 18907);
    if ( $post && in_array( $post->ID, $ids ) ) {
        $val['_uncode_headers'] = 'menu-overlay';
    }
    return $val;
}